class DevicePixelRatio {
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constructor() {
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this.bodyElement = document.getElementsByTagName('body')[0];
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}
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isWindowsSystem() {
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const agent = navigator.userAgent.toLowerCase();
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return agent.indexOf("windows") >= 0;
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}
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// 通用事件绑定工具
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addHandler(element, type, handler) {
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if (element.addEventListener) {
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element.addEventListener(type, handler, false);
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} else if (element.attachEvent) {
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element.attachEvent("on" + type, handler);
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} else {
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element["on" + type] = handler;
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}
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}
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// 校正浏览器缩放比例
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correctZoom() {
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if (this.bodyElement) {
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this.bodyElement.style.zoom = 1 / window.devicePixelRatio;
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}
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}
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// 监听页面缩放（使用防抖优化）
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watchResize() {
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let timer = null;
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this.addHandler(window, 'resize', () => {
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if (timer) clearTimeout(timer);
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timer = setTimeout(() => {
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this.correctZoom();
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}, 200);
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});
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}
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// 初始化页面比例校正
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init() {
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if (this.isWindowsSystem()) {
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this.correctZoom();
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this.watchResize();
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}
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}
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}
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export default DevicePixelRatio;
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